HELP!! Junior High Son need help with a problem

-13=4-(b/3)

if this is the problem then....

(b/3) = 4 +13

b/3 = 17

b = 17 x 3


back to you.....
 
-13=(4-b)/3

or if this is the problem....

(-13) . 3 = 4-b

-39 = 4-b

b= 4 + 39

b= 43
 
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